When you use Safari, do you feel like someone is watching you!? Those eyeglasses glaring at you, watching your every move. You wonder if the the tech department is monitoring you computer and everything you are doing. Luckily, that is not what this innocent icon is doing.
In Safari, you have a Reading List (the eyeglass icon). The Reading List "helps you collect webpages and links for you to read later." As you're browsing the web, you might find an article or blog that you like to read, but just don't have time for at the moment. When you find a website like this, you can go up to bookmarks and select 'Add to Reading List.' It will be added to your reading list, so you can indulge in that article when you have a little more time. To look at the sites you've added to your Reading List, click on the eyeglass icon and a sidebar will open on the left side of your screen. You can see all the webpages you've added to your list or only the ones that are unread. You can also add a page through this view by going to the page you want to add and clicking on 'Add Page.'
So the next time you see those "spying eyes," just remember they are your friendly bookmark tool helping you find all those great pages you wanted to read and didn't have time for before now.